Where did you hear that Beth begged for a second interview with the van der sloots? I thought Beth was nonchalant about meeting with them again. I, too, noticed Beth recoiling when the sloot mother tried kissing her.
Personally, I think Beth got all the info she needed from her sit-down with the sloots. She probably didn't see any point in meeting with the them again and didn't want to feel 'played' by them in a second interview. Sure enough, Greta gave them a prime time platform and the sloot mom was all about emotion and how hard it is on their family and boy. IMO, moma sloot came home from Holland after the fact and is trying her best to protect her son and possibly, her husband. It was imperative she give a good performance and she did.
Beth came away from her encounter with the sloots still convinced the three guys know what happened to Natalie. My money's on Beth's intuition.
It was in Rippersnapper's post 1529. Rip heard a comment from Greta on O'R..
I just rewatched the video of Beth and Greta coming out of the Van der Sloot's. I didn't see Beth exactly recoil - I sensed more weariness on her part.